Practical Sportsbikes (UK) - - What It All Means -

Ex­haust Ul­ti­mate Power Valve Yamaha’s white-hot bat­tle with Honda for tech­no­log­i­cal supremacy dur­ing the 1980s saw some truly ground break­ing ideas make pro­duc­tion. Hav­ing ar­ti­fi­cially al­tered the ex­haust port height on a two-stroke, Yamaha with its EXUP valve then changed the tuned length of a four-stroke’s ex­haust sys­tem via a ro­tat­ing ‘blade’ just af­ter the down­pipes, with the same re­sult­ing flex­i­bil­ity. Ge­nius.

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